I graduated with a computer science major, and I've taking courses on linear algebra. It didn't really hit me about practical applications of linear algebra until I watched a video on youtube by Stuff Made Here[1].

Which is funny because I totally recognize now how it can be applied, but moving from system of equations on paper to real world applications never really clicked in usefulness until it was explained in that video.

1: https://www.youtube.com/watch?v=myO8fxhDRW0.